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Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail) - 9 months ended Sep. 30, 2018 | USD ($) MWh Bcf gal | EUR (€)
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Fixed Price - Natural Gas - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | [1] | 71 |
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | [1] | 24 |
Fixed Price - Natural Gas - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | [1] | 29 |
Fixed Price - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | [1] | 4 |
Basis - Natural Gas - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity |  | 261 |
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity |  | 161 |
Basis - Natural Gas - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity |  | 607 |
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity |  | 521 |
Fixed Price - Electricity - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh | [1] | 9,770,320 |
Fixed Price - Electricity - Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh | [1] | 660,190 |
Fixed Price - Electricity - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh | [1] | 957,820 |
Financial Transmission Rights - Electricity- Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh |  | 74,350,989 |
Financial Transmission Rights - Electricity- Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh |  | 73,336,004 |
Liquids - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | gal | [2] | 35,084,400 |
Liquids - Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | gal |  | 29,708,400 |
Foreign currency |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | € |  |  | € 250,000,000
Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | € |  |  | € 250,000,000
Foreign Exchange - Non- Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [3],[4] | $ 280,000,000 |
Foreign Exchange - Non- Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [3],[5] | 280,000,000 |
Interest Rate - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [4] | 600,000,000 |
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [4] | 600,000,000 |
Interest Rate - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [4] | 5,023,819,541 |
Interest Rate - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [4] | 1,000,000,000 |
Interest Rate - Non-current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [5] | $ 1,050,000,000 |
[1] | Includes options.
[2] | Includes NGLs and oil.
[3] | Euro equivalent volumes are €250,000,000.
[4] | Maturity is determined based on final settlement period.
[5] | Maturity is based on final settlement period.

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